Dry-kiln construction



Feb. 24, 1931. A ARMS-mom 1,793,892

DHY- KILN CONSTRUCTION Filed D80. 27, 1926 INVENTOR HLBE/Pr firms rfiwva i tained within the roof.

Patented Feb. 24, 1931 UNI ED STATES PATENT/OFFICE i ALBERTARMSTRONG, or snA'r'r n, wesnrneron DRY-KILN oons r jitnorron Application filed December 27, 192e,, Serial rim-157,25. J I

\This invention relates to improvements in dry kiln construction, and more particular- 1y ,to a roof construction for dry kilns that will provide maximum insulation and also give protection to the reinforcing steel conmeans for insulating the latter and for protecting, the reinforcing steel withinthebeams against the destructive action of acids and heat produced incidental to the dryingof lumber in the kiln.

Other objects of the invention reside in the various details of construction and in the combination of parts as is hereinafter described. U

i In accomplishingthese and other objects of the invention, I have provided theim-,

proved details of construction, the preferred forms of which are illustrated in the accom- While the present invention is primarily,

intended for the construction of roofs for dry kilns, it is .to be understood that it is not confined only to this particular use, as it is well adapted to side and end wall construction in dry kilns and for various other building purposes where insulation is desired or essential, such as in refrigerating plants or the like.

In forming the roof of the present character, the usual wooden forms are first erected between the vertical walls of the kiln and these forms support the roof until the concrete has sufficiently set. In the roof con formation of concrete beams and serving as structionfl use hollowtile of the character commonly knowmas interlocking tile and wherein each tile, 1 as designated at 1, comprises a hollow, rectangu lar base portion 2, approximately six-and one-half in'eheswide, l twelve inches lou g and four inches 1 high, and which is provided lengthwise =and centrally across the top surface with a hollow rib portion 3' about four inches wide and four inches hi'gln The base portion of the tile is divided leiig thwise by (a vertical, centrally located :\VQl) 2"" and the rib portion divided length- *Wise by a horizontal, centrally locatedweb 3'. The tile are laid upon forms in parallel rows, tightly togetheryas indicated in the drawing; so as i to provide continuous insulation across the under 1 side of the roof. it After the tile have thus been laid oir the forms, reinforcing bars 4 of any desirable character are placed longitudinally within thesp aces provided between the parallel rows of i ibs and are supported in proper position by any suitable means, not shown, prior to the pouring of the concrete. Other reinforcing bars 5 may also be located transversely of the rows of tile across the upper side of the ribs to give additional strength to the roof and to serveas means for preventing cracking.

After the concrete has been poured over the tile to fill the spaces between the rows of ribs and to cover the latter to athickness of about three inches, it is troweled ofi' smooth to provide for easy drainage.

It is readily apparent that with the tile so placed, the rows of ribs provide forms for the formation of the supporting beams 6 for the roof slab 7 and since the ribs of the tile are hollow as well as the base portions of the tile, each of these beams will be well insulated. This method of insulating prevents not only absorption of heat by the walls but also prevents damage. to the min forcing steel that is sometimes caused where such insulation is not provided by the action 5 of the acid contained in the vapor arising from the lumber being dried within the kiln.

It is to be understood that tiling of various character other than herein shown or described may be used for this purpose, and

when tiling of the character shown is used it may have various proportions other than those herein stated and, for these reasons I do not wish to be confined only to that shown and described. r

I It has beenfound that a roof so constructed gives perfect insulation and afiords protection to the reinf0rcing 'ir0n to an extentthat c makes the present construction more service: 10 able and desirable than roof constructions commonly used. i? I r k r 5 Having thus described my invention, what I claim as new therein and desire to secure by Letters-Patent, is: I I a A lumber dry kiln roof comprising an under surface lining formed from hollow I tile that are laid injuxtaposit-ion and a con- .7 crete top surface overlying the tiling to a substantial thickness; said tiling having hol-i low, upstanding; ribs formed thereonwhereby they are supported and arranged in coextensive relation to provide forms for the "formation between them of concrete supporting beams integral with the top surface and V reinforcingbars imbedded inthe beams; said fhojllow tile construction being substantially a continuous one over the entire lower surface 7 iofithe roof and forming a dead air space below the concrete top surface and supportv ing beams whereby absorption ofacid by the I concrete from lumber being dried is avoided and whereby Troof drip caused by a differv ential in temperatures inside andoutside the V c kiln is overcome. Y a i' 535 Signed at Seattle, WVashingt-omthislth day elf-December, 1926.

r I ALBERT ARMSTRONG. 

